| 摘要 |
PROBLEM TO BE SOLVED: To provide a die forming-welding method of a closed cross-sectional hollow metallic part, capable of applying resistance welding to a closed cross-sectional hollow metallic material provided by bulge molding, without impairing an advantage of the bulge molding; and a molding welding device used for performing this method. SOLUTION: First of all, a hollow pipe-shaped metallic element pipe M1 and the other metallic part M2 are arranged in a molding chamber 13 of a metal mold, and an opening part of the element pipe is sealed so that the inside of the metallic element pipe M1 becomes an airtight or liquidtight state. Next, a pressure medium is supplied inside the metallic element pipe M1, and while sandwiching the other metallic part M2 between a welding electrode 15 and the metallic element pipe M1 expanding in response to an internal pressure increase, the metallic element pipe M1 is bulgingly molded in an inside shape of the molding chamber 13. While highly maintaining internal pressure of the metallic element pipe M1, an electric current is carried between the welding electrode 15 contacting with the other metallic part M2 and a counter electrode connected to the metallic element pipe M1, and the resistance welding is applied to a joining part corresponding to the welding electrode 15. COPYRIGHT: (C)2005,JPO&NCIPI
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